iminium compounds
Salts in which the @C00907@ has the structure R2C=N+R2. Thus N-hydronated @I02957@ and their N-substituted derivatives. The synonymous terms imonium compounds and immonium compounds are irregularly formed and should not be used.
quaternary ammonium compounds
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1343 [Terms] [Paper]